Printing machine



FIG. 1 is a perspective view of a printing machine showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is right side elevational view thereof;

FIG. 4 is rear elevational view thereof;

FIG. 5 is left side elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

The ornamental design for a printing machine, as shown and described. 